777668 has 12 divisors (see below), whose sum is σ = 1367100. Its totient is φ = 387072.

The previous prime is 777661. The next prime is 777671. The reversal of 777668 is 866777.

It can be written as a sum of positive squares in 2 ways, for example, as 262144 + 515524 = 512^2 + 718^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 777668.

It is not an unprimeable number, because it can be changed into a prime (777661) by changing a digit.

777668 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1508 + ... + 1956.

It is an arithmetic number, because the mean of its divisors is an integer number (113925).

2⁷⁷⁷⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

777668 is a deficient number, since it is larger than the sum of its proper divisors (589432).

777668 is a wasteful number, since it uses less digits than its factorization.

777668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886 (or 884 counting only the distinct ones).

The product of its digits is 98784, while the sum is 41.

The square root of 777668 is about 881.8548633420. The cubic root of 777668 is about 91.9598123153.

The spelling of 777668 in words is "seven hundred seventy-seven thousand, six hundred sixty-eight".